JP2005168109A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional structure that it is possibly overheated because heat is generated from a clamper due to leakage flux from the stator end part. <P>SOLUTION: The rotary electric machine comprising a finger member 2 having nonmagnetic metal members 2a arranged radially at the end part of a stator core 1 in the laminating direction and a member 2b for coupling the nonmagnetic metal members sequentially in the circumferential direction, and a ring-shaped clamper 3 arranged on the outside of the machine in the axial direction of the finger member further includes a member 7 for partitioning the cooling gas duct in the axial direction along the outer circumferential part of the clamper, and an air gap part 4 for conducting the cooling gas in the radial direction between the clamper and a plurality of connecting members arranged in the radial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine such as a turbine generator, and more particularly to an improvement in a cooling structure of a stator core end.

  A stator core end in a rotating electric machine such as a conventional turbine generator is a rod-shaped nonmagnetic metal member arranged radially on the end surface of the stator core in the stacking direction from the tip of the core tooth to the outer periphery of the core. In order to ensure mechanical strength, a finger member composed of a cross member that connects these non-magnetic metal members in the circumferential direction, and a clamper made of a magnetic integral ring on the outer side in the axial direction of the finger member are axially connected by through bolts and core bolts. The structure which can fix to the front-end | tip part of a tooth | gear part from the outer peripheral part of a stator core has been applied.

  The clamper is installed on the outer diameter side of the iron core so as not to interfere with the end of the armature winding. In order to firmly fix the tip of the tooth portion of the iron core by this clamper, the height of the rod-shaped nonmagnetic metal member constituting the finger member is as large as several tens of mm, for example. In addition, a ventilation hole is provided behind the stator core, and the cold part gas introduced into the machine by a fan (not shown) at the shaft end flows into the radial duct of the iron core and from the ventilation hole to the core. (See, for example, Patent Document 1).

  The above configuration is applied to small-capacity machines with small electric loads. However, with medium- and large-capacity machines, the electric load is large, so leakage occurs from the end of the armature winding and the end of the rotor winding. The magnetic flux increases and eddy current loss generated in the integrated clamper increases, and overheating may occur particularly at the inner peripheral position of the clamper. As a countermeasure for this, medium- and large-capacity machines have a structure in which a shield core, which is a magnetic flux shunt in which steel plates are laminated, is provided outside the clamper in the axial direction to reduce eddy current loss. Note that the cooling gas flow in the stator core end support device with the shield core is the same as in Patent Document 1 (see, for example, Patent Document 2).

JP-A-56-49939 (pages 2 to 3, FIG. 1) Japanese Patent Laid-Open No. 11-252830 (page 3, FIG. 1)

  Since the end of the stator core is configured as described above in the conventional rotating electric machine, the cooling of the loss caused by the leakage magnetic flux flowing into the clamper from the end of the stator winding is performed on the side surface outside the clamper machine. Although it is performed by the flowing cooling gas, since the cooling channel area is large with respect to the cooling air volume, the wind speed is about several m / sec, and efficient cooling has not been performed.

  The present invention has been made to solve the above-described problems of the prior art, and by improving the cooling structure of the stator end including the clamper, the temperature rise due to eddy current loss is suppressed, and the reliability is improved. It is another object of the present invention to provide a rotating electrical machine with improved durability.

  A rotating electrical machine according to the present invention includes a plurality of nonmagnetic metal members provided radially corresponding to tooth portions at axial end portions of a stator core, and a bridging member that sequentially connects adjacent nonmagnetic metal members to each other in the circumferential direction. A partition for partitioning a cooling gas ventilation path in the axial direction along the outer peripheral portion of the clamper in a rotary electric machine comprising a finger member having a ring shape and a ring-shaped clamper disposed outside the axial machine of the finger member In addition to providing a member, a plurality of the transition members are provided in the radial direction, and a gap for allowing a cooling gas to flow in the radial direction is provided between the transition member and the clamper.

  According to this invention, while providing a space | gap part between the transition member and clamper which comprise a finger member, and aligning the position of the partition member of a stator core outer peripheral part with the axial direction position of a clamper, the back surface ( A flow path for cooling the machine inner side surface portion is formed, and the cooling efficiency of the clamper is improved, whereby a rotating electrical machine with improved reliability and durability can be obtained.

Embodiment 1 FIG.
Embodiment 1 for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a main part sectional view schematically showing a stator end part of a rotating electrical machine such as a turbine generator according to Embodiment 1, and FIG. 2 is a sectional view taken along the line II-II in FIG. As shown in the figure, the stator end of the rotating electrical machine according to the first embodiment is the end in the stacking direction of the stator core 1 stacked in the axial direction of the rotor (not shown). A finger member 2 comprising a rod-like nonmagnetic metal member 2a disposed in correspondence with a tooth portion (not shown) and a bridging member 2b that sequentially connects the adjacent nonmagnetic metal members 2a in the circumferential direction; A ring-shaped clamper 3 that integrally clamps the finger member 2 and the stator core 1 is provided, and a gap 4 is formed between the transition member 2 b and the clamper 3. A plurality of the transition members 2b are provided in the radial direction.

  In addition, 5 is the core part ventilation duct provided in the radial direction in the laminated | stacked stator core 1, 6 is a stator coil, and the solid line arrow A shows the flow of cooling gas. Reference numeral 7 denotes a wind partition member for partitioning the high pressure zone H and the low pressure zone L, which is moved to the outside in the axial direction (right direction in the figure) and installed at the outer peripheral position of the clamper 3 as compared with the conventional structure. Yes. The through bolts, core bolts, etc. are not shown. Further, FIG. 1 shows the vicinity of the right end of the stator as viewed from the direction orthogonal to the rotation axis, and the left end, which is not shown, is similarly configured. The same reference numerals denote the same or corresponding parts throughout the drawings.

  Next, the operation of the first embodiment configured as described above will be described. In the first embodiment, the air gap 4 provided between the finger member 2 and the clamper 3 is used as a ventilation path, and the air gap 4 between the cross member 2b and the clamper 3 is formed as indicated by an arrow A in the cooling gas. When passing in the outer circumferential direction, the flow velocity increases, and in the radial space of the crossover member 2b, it turns into a turbulent flow, thereby improving the heat transfer between the clamper 3 and the cooling gas and increasing the cooling efficiency. be able to. Further, the position of the partition member 7 provided in the vicinity of the axial end of the outer peripheral portion of the stator core 1 is substantially matched with the axial position of the clamper 3, so that the back surface (side surface of the machine inner side) of the clamper 3 is placed in the high pressure zone. The flow path of the cooling gas flowing from H to the low pressure zone L is formed, and the cooling of the clamper 3 can be improved.

  As described above, according to the first embodiment, the gap portion 4 is provided between the plurality of transition members 2b constituting the finger member 2 and the clamper 3, and the position of the partition member 7 on the outer peripheral portion of the stator core 1 is set. By matching with the axial position of the clamper 3, a flow path is formed in which the cooling gas flows from the high pressure zone H to the low pressure zone L to cool the back surface (side surface of the machine) of the clamper 3. Can be improved and the temperature rise can be reduced. As a result, a rotating electrical machine with improved reliability and durability can be obtained.

Embodiment 2. FIG.
3 and 4 show a rotary electric machine according to Embodiment 2 of the present invention. FIG. 3 is a cross-sectional view schematically showing a main part structure of a stator end, and FIG. 4 is a line IV-IV in FIG. FIG. As shown in the figure, in the second embodiment, among the plurality of transition members 2b constituting the finger member 2, the transition on the innermost side (the lower side in the figure, ie, the direction of the rotation axis not shown) is performed. The member 2b is provided in the vicinity of the inner peripheral portion 3A where the loss density in the clamper 3 is maximum as compared with the first embodiment. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  According to the second embodiment configured as described above, the same effect as in the first embodiment can be obtained, and the transition member 2a configuring the finger member 2 is disposed in the vicinity of the inner peripheral portion 3A of the clamper 3. As a result, the flow velocity of the cooling gas is increased on the back surface side of the inner peripheral portion 3A of the clamper 3 having the highest loss density, and the clamper 3 can be cooled more efficiently.

Embodiment 3 FIG.
5 and 6 are views schematically showing main parts of a rotating electrical machine according to Embodiment 3 of the present invention. FIG. 5 is a sectional view showing the structure of the stator end, and FIG. 6 shows the stator end. It is arrow sectional drawing in the VI-VI line of FIG. 5 seen in the inner peripheral direction from the outer peripheral side. As shown in the figure, in the third embodiment, there are a large number of radial radial air passages 31 that allow the cooling gas to flow in the radial direction as indicated by arrow B on the surface where the clamper 3 is in contact with the finger member 2. Is provided. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  According to the third embodiment configured as described above, in addition to the effects of the second embodiment, by providing a large number of radial radial passages 31 on the inner side surface of the clamper 3, the clamper 3 The cooling area is increased, and the cooling effect by the cooling gas is further improved. Further, the increase in the surface area of the clamper 3 contributes to a reduction in the loss with respect to the axial leakage magnetic flux.

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view schematically showing a stator end portion of a rotating electrical machine according to Embodiment 4 of the present invention. As shown in the figure, in the fourth embodiment of the present invention, a shield core 8 formed in a laminated structure on the machine outer side (right side in the figure) of the clamper 3 and the shield core 8 is fixed from the outside in the axial direction. In the rotating electrical machine provided with the shield presser 9 to be provided, a plurality of axial ventilation holes 10 that penetrate the shield presser 9, the shield core 8, and the clamper 3 in the axial direction are provided, and the gap portion 4 that constitutes the radial ventilation path Communicated with Since other configurations are substantially the same as those of the second embodiment, description thereof is omitted.

  According to the fourth embodiment of the present invention configured as described above, in addition to the same effects as those of the second embodiment, in the stator end configuration having the shield core 8, a new axial direction of the shield core By forming the axial ventilation hole 10 as the cooling flow path, a flow path through which the cooling gas flows in the direction of arrow C is formed, and the cooling performance of the shield core 8 and the clamper 3 is further improved. Further, when the insulating core such as a core varnish is provided on the surface of the shield core 8 and laminated, there is a thermal resistance and it is difficult to cool, but in the fourth embodiment, the shield core 8 is provided with the axial ventilation holes 10. By penetrating, the shield core 8 is cooled by the cooling gas flowing through the inside of the shield core 8, so that the cooling efficiency is improved.

  In the description of the above embodiment, the case where the rotating electrical machine is a turbine generator has been described. However, the present invention is not limited to this. Further, the example in which the three transition members 2b are provided in the radial direction has been described, but the same effect can be expected if two, four or more, or a plurality of the transition members 2b are provided.

It is principal part sectional drawing which shows typically the structure of the stator edge part of the rotary electric machine by Embodiment 1 of this invention. It is arrow sectional drawing in the II-II line | wire of FIG. It is principal part sectional drawing which shows typically the structure of the stator edge part of the rotary electric machine by Embodiment 2 of this invention. It is arrow sectional drawing in the IV-IV line of FIG. It is sectional drawing which shows typically the structure of the stator edge part of the rotary electric machine by Embodiment 3 of this invention. It is arrow sectional drawing which looked at the stator edge part in the VI-VI line of FIG. 5 in the inner peripheral direction from the outer peripheral side. It is sectional drawing which shows typically the stator edge part of the rotary electric machine by Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator iron core, 2 Finger member, 2a Nonmagnetic metal member, 2b Transition member, 3 Clamper, 3A Inner peripheral part, 31 Radial direction ventilation path, 4 Air gap part, 5 Iron core part ventilation duct, 6 Stator coil, 7 Partition Member, 8 shield core, 9 shield presser, 10 axial ventilation hole.

Claims (4)

  A stator core having teeth stacked in the direction of the rotation axis, and a plurality of nonmagnetic metal members radially provided at the axial ends of the stator core corresponding to the teeth and adjacent nonmagnetic metals In a rotating electrical machine comprising a finger member having a transition member that sequentially connects members in the circumferential direction and a ring-shaped clamper disposed outside the axial machine of the finger member, along the outer periphery of the clamper A partition member for partitioning the cooling gas ventilation passage in the axial direction is provided, and a plurality of the transition members are provided in the radial direction, and a gap for allowing the cooling gas to flow in the radial direction is provided between the transition members and the clamper. A rotating electric machine characterized by   A shield core in which steel plates are laminated on the outer side of the clamper in the axial direction is provided, and an axial ventilation hole that penetrates the shield core and the clamper in the axial direction and communicates with the gap is provided. Item 2. The rotating electrical machine according to Item 1.   3. The rotating electrical machine according to claim 1, wherein a transition member on the innermost diameter side of the transition members is provided in the vicinity of an inner peripheral position of the clamper. 4. The clamper according to any one of claims 1 to 3, wherein the clamper is provided with a radial ventilation path including a plurality of radial grooves for allowing cooling air to flow on a surface portion facing the finger member. The rotating electrical machine described in 1.

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